Add support for x-enum-varnames to string enums (#1358) #3273

Job	Run time
test_min_deps (windows-latest)	1m 3s
test_min_deps (macos-latest)	1m 6s
Integration Tests (pdm.minimal.lock)	21s
test_min_deps (ubuntu-latest)	40s
Integration Tests (pdm.lock)	30s
test (3.10, ubuntu-latest)	1m 0s
test (3.10, windows-latest)	1m 58s
test (3.11, macos-latest)	58s
test (3.10, macos-latest)	49s
test (3.12, ubuntu-latest)	1m 4s
test (3.12, windows-latest)	2m 0s
test (3.13, macos-latest)	44s
test (3.12, macos-latest)	38s
test (3.14, ubuntu-latest)	1m 6s
test (3.13, windows-latest)	1m 37s
test (3.11, windows-latest)	1m 35s
test (3.11, ubuntu-latest)	57s
test (3.14, windows-latest)	1m 43s
test (3.14, macos-latest)	37s
test (3.13, ubuntu-latest)	1m 8s
Combine & check coverage	13s
	21m 47s

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